Adds scroll position/scale emulation to DevTools.

third_party/WebKit/Source/core/frame/VisualViewport.h

 /*
  * Copyright (C) 2013 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 85 matching lines @@
     void initializeScrollbars();
 
     // Sets the location of the visual viewport relative to the outer viewport. The
     // coordinates are in partial CSS pixels.
     void setLocation(const FloatPoint&);
     // FIXME: This should be called moveBy
     void move(const FloatPoint&);
     void move(const FloatSize&);
     FloatPoint location() const { return m_offset; }
 
+    // Override the visual viewport location and scale with a fixed value.
+    void setScaleAndScrollOverride(float scale, const FloatPoint& location);
+    // Clear the scroll position override.
+    void clearScaleAndScrollOverride();
+
     // Sets the size of the inner viewport when unscaled in CSS pixels.
     void setSize(const IntSize&);
     IntSize size() const { return m_size; }
 
     // Gets the scaled size, i.e. the viewport in root view space.
     FloatSize visibleSize() const;
 
     // Resets the viewport to initial state.
     void reset();
 
@@ skipping 116 matching lines @@
 
     // GraphicsLayerClient implementation.
     bool needsRepaint(const GraphicsLayer&) const { ASSERT_NOT_REACHED(); return true; }
     IntRect computeInterestRect(const GraphicsLayer*, const IntRect&) const;
     void paintContents(const GraphicsLayer*, GraphicsContext&, GraphicsLayerPaintingPhase, const IntRect&) const override;
     String debugName(const GraphicsLayer*) const override;
 
     void setupScrollbar(WebScrollbar::Orientation);
     FloatPoint clampOffsetToBoundaries(const FloatPoint&);
 
+    FloatPoint applyScrollOverrideToLocation(const FloatPoint& location);
+    float applyScaleOverrideToScale(float scale);
+
     LocalFrame* mainFrame() const;
 
     FrameHost& frameHost() const
     {
         ASSERT(m_frameHost);
         return *m_frameHost;
     }
 
     Member<FrameHost> m_frameHost;
     OwnPtr<GraphicsLayer> m_rootTransformLayer;
     OwnPtr<GraphicsLayer> m_innerViewportContainerLayer;
     OwnPtr<GraphicsLayer> m_overscrollElasticityLayer;
     OwnPtr<GraphicsLayer> m_pageScaleLayer;
     OwnPtr<GraphicsLayer> m_innerViewportScrollLayer;
     OwnPtr<GraphicsLayer> m_overlayScrollbarHorizontal;
     OwnPtr<GraphicsLayer> m_overlayScrollbarVertical;
     OwnPtr<WebScrollbarLayer> m_webOverlayScrollbarHorizontal;
     OwnPtr<WebScrollbarLayer> m_webOverlayScrollbarVertical;
 
     // Offset of the visual viewport from the main frame's origin, in CSS pixels.
     FloatPoint m_offset;
     float m_scale;
     IntSize m_size;
     float m_topControlsAdjustment;
     float m_maxPageScale;
     bool m_trackPinchZoomStatsForPage;
+
+    bool m_scaleAndScrollOverrideEnabled;
+    float m_scaleAndScrollOverrideScale;
+    FloatPoint m_scaleAndScrollOverrideLocation;
 };
 
 } // namespace blink
 
 #endif // VisualViewport_h